Electric meter.



0. 706,555. Patented Aug. \2, \QU'Z.

' C. D. HASKlN-S.

ELECTRIC METER.

(Application filed 1m). 1a, 1901.

' (in Model.)

2 Sheets-sheaf l.

Invnbqn Caryl [)Haskms.

No. 706,555. Patented Aug. l2, I902.

c. n. HASKINS; v Y

ELECTRIC METER.

(Applioption filed 25b. is, 1901.

(No Model.) 5

2 Shouts-Sheet 2.

Wibncs sesf Inventor 5 K CPLflD Ha kins.

v V I Hbbg UNITED STATES PATENT OFFICE.

CARYL D. I-IASKINS, OF SCI-IENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ELECTRIC METER.

SPECIFICATION forming part of Letters Patent No. 706,555, dated August 12, 1902.

Application filed February 13, 1901. Serial No. 47,092. (N0 modem T0 to whom, it may concern:

Be it known that I, CARYL D. HASKINS, a citizen of the United States, residing at Schen ectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Electric Meters, (Case No. 1,452,) of which the following is a specification.

The present invention relates to electric wattmeters, particularly of the Thomson re-' cording type, the object of the invention bein g to facilitate and render more accurate the adjustment of the. meter to suit local conditions. x

In a prior patent issued tome, No. 653,806, dated July 17, 1900, I describedimprovements in which an adjustable coil was employed to vary the torque on the armature, so as to provide a sufficient auxiliary torque to that eX- ercised by the energy passing through the meter and in power sufficient to counterbalance the starting-friction, thus rendering the instrument better adapted for accurate work on small loads. My present invention is a re finement on the organization described in that patent and includes also means by which a portion of the armature-resistance may be shunted when desired to adaptit for accurate work on circuits of different voltage and for systems using either two or three wires for distribution. In carrying out these improvements I mount the starting-coil on a frame inclosing the armature. The coil is preferably divided into halves disposed one on each side] of the armature-shaft. The frame is carried on a sleeve concentric with the armature-shaft and angularly adjustable with reference thereto, being retained in position bymeans of a suitable clamp. The rotation of thesleeve alters the relative positions of the startingcoils, so as to vary their compensating efiect in the manner explained in my aforesaid patent.

The'meter mechanism is protected by a glass case or cover held against the back or base plate of the instrument by .one or more metallic bands passing over the cover and clamped to the back at each end or in any other suitable way.

In the accompanying drawings, Figure 1 is a front elevation of a Thomson recording-wattmeter embodying my improvements.

. the starting-coil.

back of the meter. circuit connection.

.justment to suit any Fig. 2 is a front elevation, partly in section, of the starting-coil, sleeve, and clamp on an enlarged scale. Fig. 3 is a side elevation of Fig. 4 is a sectional elevation on the line 4 4, Fig. 2. .Fig. 5 is acrosssection of the back plate and cover. Fig. 6 is a sectional elevation of the field-coils, starting-coils, and .armature. Fig. 7 shows the Fig. Sis a diagram of the The starting-coil is made in sections A A, wound on light trough-shaped hoops B B, preferably rectangular and supported in parallel planes by cross-bars-b at the top and a 6 5 head I) at the bottom, having ears b clamped to the hoops. by strips 19 The head I) is mounted transversely on one end of an upright sleeve 13*, concentric with the shaft C of the armature C and rotatable in a bearing D, havinga cap D, which can beclainped by screws 01 to retain the sleeve in position after it has been angularly adjusted. A split collar E embraces the-sleeve and rests on the bearing, having a screw e by which it can be tightened to holdthe sleeve after it has been vertically adjusted. The starting-coils AA are symmetrically arranged on eachside of the armature and inside of the field-coils F.

By giving the sleeve a partial rotation the planes of the starting-coils will be placed more or less transverse to those of the field-coils, so that the torque on thearmature will be correspondingly varied and modulated by adparticular condition of installation, Thus the friction may be com- 'pensated to balance the varying degree of friction in diiferent instruments and to balance also the jarring, vibration, and other interfering conditions of special locations. 9o

Heretofore instruments have generally been protected by sheet-metal covers attached to the back or base plate by screws, springcatches, or the like; but a glass cover cannot be readily attached in this way, owingto the 5 liability of breakage of the lugs or other attachments on the cover. I provide a-simple and yet safe and emcient means for holding a glass cover to the base-plate. The front of the base-plate Ghas a shallow groove 91, pref- 10o erably lined with felt or the like, against which fits the glass cover H. One or more thin metallic bands I pass over the cover and are fastened at each end by screws 2', enterin g ears g on the base-plate, thereby securely series with the armature.

holding the glass cover in place without danger of its breaking loose and without obstructing a clear view of the mechanism. The hand or bands may be utilized to display the name, maker, patent-markings, 850., of the instrument. The base-plate is recessed in the rear to house the resistance-coils K of the potential circuit, in which the armature is connected, and the insulating-board L, on which are mounted the two sockets M M for the line-terminals of a two-wire system, the socket M for the additional line-terminal of a three-wire system, and the two sockets M M for the Work-circuit terminals. One fieldcoil is connected across the sockets M M and the other across the sockets M M One end of the resistance K is connected with the socket M and the other end with the socket M through the starting-coils, which are in Sockets M and M are connected, and a switch N provides for connecting them with a shunt around several of the resistance-coils when the meter is used on a low-voltage circuit or in a three-wire system.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. In an electric motor-meter, a startingcoil wound in halves symmetrically disposed with relation to the armature shaft, and means for adjusting said coil angularly around said shaft.

2. In an electric motor-meter, a startingcoil having a plurality of sections, and a sleeve concentric with the armature-shaft supporting said sections within, and symmetrically related to, the field-coils. I

3. In an electric motor-meter, a sectional starting-coil, a rotatable sleeve concentric with the armature-shaft and carrying said coil, a bearing in which said sleeve is rotatable, and means for holding the sleeve and coils in any angular position with reference to the shaft.

4. In an electric motor-meter, a startingcoil, a rotatable sleeve concentric with the armature-shaft and carrying said coil, and a clamp between the sleeve and its support.

5. In an electric motor-meter, a startingcoil wound in halves on trough-shaped hoops located on each side of the armature.

6. In an electric motor-meter, the combination with a sleeve, of a head mounted transversely thereon, and two hoops carried by OARYL D. I-IASKINS.

Witnesses:

BENJAMIN B. HULL, MARGARET E. WOOLLEY. 

